Sequence Distribution and Stereoregularity in Styrene/Butyl Methacrylate Copolymers Obtained at High Conversion by Stable Free-Radical Polymerization

Abstract

13C NMR spectra of styrene/butyl methacrylate copolymers prepared in bulk at 125°C using 2,2,6,6‐tetramethyl‐1‐(1‐phenylethoxy)piperidine as the initiator were analyzed. After assignment of the carbon resonances of the aromatic C‐1 region, the Mayo‐Lewis terminal model (MLTM) was tested by comparison of experimental and predicted values of configurational triad sequences. It follows that MLTM provides an excellent prediction across a wide conversion range for all comonomer feeds.

Interleukin‐11 signaling is required for the differentiation of natural killer cells at the maternal–fetal interface

“…This behavior is quite different than that observed in a free‐radical copolymerization of S with BMA mediated by a nitroxide of the first generation (PETEMPO) where the composition and sequence distribution can be qualitatively described by the Mayo–Lewis terminal model (MLTM) 22, 36. In this system the efficiency of the initiator decreased with an increased BMA molar fraction in the feed, although a linear dependence of D̄P n with conversion was observed.…”

Quality of life in systemic sclerosis: Psychometric properties of the World Health Organization Disability Assessment Schedule II

“…The following study first evaluates the NMP kinetics of various methacrylates such as MMA, ethyl methacrylate (EMA), and n ‐butyl methacrylate (BMA) in solution at 90 °C with a small amount of styrene comonomer and BlocBuilder as the unimolecular initiator. EMA and BMA have both been previously copolymerized with styrene by NMP with TEMPO using low methacrylate feed compositions but in all cases the propensity of irreversible termination reactions was apparent at low conversions (∼30%) 47–49…”

Design of Copolymers Based on Sequence Distribution for a Targeted Molecular Weight and Conversion

“…In addition, the chemical composition distribution (CCD), which can be the fingerprint of the sequence, can be measured using MALDI‐ToF‐MS . Studies using 1 H NMR and 13 C NMR for sequences include the investigation of copolymers of acrylates and methylacrylates, styrene and butyl methacrylate copolymers synthesized using living radical polymerization, and conventional free radical copolymerization of MMA/MA, styrene/MMA, MMA/BA, and ethyl acrylate/butyl methacrylate . Recent work by the Genzer group represents a significant advance in tailoring monomer sequences using “chemical coloring,” and demonstrates how interfacial and self‐assembly characteristics of polymers can be strongly influenced by sequence …”